User's Manual

P440 Data Sheet / User Guide DRAFT 23
The P440 requires less than 2.5 Watts from a DC supply that provides any voltage between 4.5 and
48 volts. This power can be provided through Time Domain’s standard external power supply, a
battery, or a user-supplied power source. Indicator lights provide operating status information.
The user can interface to the P440 through Ethernet, USB, SPI, Serial, or CAN. Ten GPIO pins are
available. If the SPI interface is not used, then these pins can be reassigned yielding an additional
five GPIOs for a total of 15.
In addition, the user can request that the P440 report the board temperature.
A variety of means have been provided to physically interface to the P440. These means include
USB connectors, an Ethernet RJ45 connector, a locking connector, and three mezzanine connectors.
See Section 4 for details. The mezzanine connectors are suitable for mating directly with a customer-
provided board. Mating mezzanine connectors can be ordered with a variety of mated heights,
thereby allowing the user to mount low profile devices on their carrier board underneath the P440.
See Section 5 for details.
Two SMA connectors are provided for antennas. Most ranging applications require only one antenna
but there are cases where two can provide additional functionality. Most radar applications require
two antennas.
The processor controls the UWB front end through a Digital Baseband FPGA interface. More
specifically, the FPGA acts as a digital baseband to configure and control Time Domain’s Fully
Integrated Front End (FIFE) UWB ASIC such that it is possible to transmit and receive packets to
measure range and to send/receive data.
There are four other items of note concerning the RF section:
 The FIFE Pulser is provided with a variable attenuator that allows the user to reduce the
transmit power by approximately 20 dB below the regulatory limit. The exact amount or
reduction will vary a bit from unit to unit.
 The T/R switch supports several configurations: Transmit/Receive on Port A,
Transmit/Receive on Port B, Transmit on A and Receive on B, and Transmit on B and
Receive on A.
 The Receive chain has a series of gain stages and band pass filters.
 An optional power amplifier can be provided to boost the transmitted signal power by up to
10 dB. Additional details are provided in Section 4 – Electrical Interfaces. This option is
intended for experimentation and evaluation only. Using it for any other purpose will exceed
regulatory limits in the US. Using the power amplifier in other countries, even for
experimentation, may require special permission.